Style de citation APA (7e éd.)

Powell, H. B. (1956). The original has this signature--W. K. Kellogg. Prentice-Hall.

Style de citation Chicago (17e éd.)

Powell, Horace B. The Original Has This Signature--W. K. Kellogg. Englewood Cliffs, N.J.: Prentice-Hall, 1956.

Style de citation MLA (8e éd.)

Powell, Horace B. The Original Has This Signature--W. K. Kellogg. Prentice-Hall, 1956.